A New Cepheid Distance Measurement and Method for NGC 6822

Abstract

We present a revised distance to the nearby galaxy NGC6822 using a new multi-band fit to both previously published and new optical, near- and mid-infrared data for Cepheid variables. The new data presented in this study include multi-epoch observations obtained in 3.6\um and 4.5\um with the \emph{Spitzer Space Telescope} taken for the Carnegie Hubble Program. We also present new observations in J, H and \kswith FourStar on the Magellan Baade telescope at Las Campanas Observatory. We determine mean magnitudes and present new period-luminosity relations in V, I, J, H, \ks, IRAC 3.6\um and 4.5\um. In addition to using the multi-band distance moduli to calculate extinction and a true distance, we present a new method for determining an extinction-corrected distance modulus from multi-band data with varying sample sizes. We combine the distance moduli and extinction for individual stars to determine $E(B-V)=0.35\pm 0.04$ and a true distance modulus ${\mu }_o=23.38\pm 0.02_{stat}\pm 0.04_{sys}$.

arXiv commentAccepted for publication in ApJ, 25 pages, 18 figures, 1 table

References in corpus (22)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• SINGS: The SIRTF Nearby Galaxies Survey
• Color Transformations for the 2MASS Second Incremental Data Release
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• Absolute Calibration of the Infrared Array Camera on the Spitzer Space Telescope
• Carnegie Hubble Program: A Mid-Infrared Calibration of the Hubble Constant
• A new calibration of Galactic Cepheid Period-Luminosity relations from B to K bands, and a comparison to LMC PL relations
• The Nature of Starbursts: I. The Star Formation Histories of Eighteen Nearby Starburst Dwarf Galaxies
• The Carnegie Hubble Program: The Leavitt Law at 3.6 and 4.5 micron in the Milky Way
• Mean JHK Magnitudes of Fundamental-Mode Cepheids from Single-Epoch Observations
• The Large Magellanic Cloud and the Distance Scale
• The Carnegie Hubble Program: The Leavitt Law at 3.6 μm and 4.5 μm in the Large Magellanic Cloud
• RR Lyrae and short-period variable stars in the dwarf irregular galaxy NGC 6822
• The Araucaria Project. The Distance to the Local Group Galaxy NGC 6822 from Cepheid Variables discovered in a Wide-Field Imaging Survey
• The Carnegie Hubble Program
• The Local Group Galaxy NGC 6822 and its Asymptotic Giant Branch Stars
• The Cepheid distance to the Local Group Galaxy NGC 6822
• The Carnegie Hubble Program: The Infrared Leavitt Law in IC 1613
• The Star Formation Histories of Four Fields Spanning the Minor Axis of NGC 6822
• The Cepheid Period-Luminosity Relation (The Leavitt Law) at Mid-Infrared Wavelengths: III. Cepheids in NGC 6822
• Distance and reddening of the Local Group dwarf irregular galaxy NGC 6822
• Variable stars in nearby galaxies. V. Search for Cepheids in Field A of NGC 6822

Cited by in corpus (27)

• The Carnegie-Chicago Hubble Program. VIII. An Independent Determination of the Hubble Constant Based on the Tip of the Red Giant Branch
• Physical Properties of Molecular Clouds at 2 parsec Resolution in the Low-Metallicity Dwarf Galaxy NGC 6822 and the Milky Way
• Old-Aged Stellar Population Distance Indicators
• The panchromatic view of the Magellanic Clouds from Classical Cepheids. I. Distance, Reddening and Geometry of the Large Magellanic Cloud disk
• Large Magellanic Cloud Near-Infrared Synoptic Survey. II. The Wesenheit relations and their application to the Distance scale
• The Carnegie Chicago Hubble Program: The Mid-Infrared Colours of Cepheids and the Effect of Metallicity on the CO Band-head at $4.6\mu$m
• Toward an internally consistent astronomical distance scale
• Astrophysical Distance Scale II. Application of the JAGB Method: A Nearby Galaxy Sample
• Detailed chemical composition of classical Cepheids in the LMC cluster NGC 1866 and in the field of the SMC
• The Sample of Red Supergiants in Twelve Low-Mass Galaxies of the Local Group
• On a new method to estimate distance, reddening and metallicity of RR Lyrae stars using optical/near-infrared ($B$,$V$,$I$,$J$,$H$,$K$) mean magnitudes: $\omega$ Centauri as a first test case
• Carbon stars as standard candles: II. The median J magnitude as a distance indicator
• Carbon stars as standard candles -- III. Un-binned maximum likelihood fitting and comparison with TRGB estimations
• Candidate LBV stars in galaxy NGC 7793 found via HST photometry + MUSE spectroscopy
• Evolved Massive Stars at Low-metallicity IV. Using 1.6 $\mu$m "H-bump" to identify red supergiant stars: a case study of NGC 6822
• The Young Stellar Population of the metal-poor galaxy NGC 6822
• Updated 24 $\mu \mathrm{m}$ Period-Luminosity Relation Derived from Galactic Cepheids
• Young and Intermediate-age Distance Indicators
• Mathematical Underpinnings of the Multi-Wavelength Structure of the TRGB
• Geometry of the Large Magellanic Cloud Using Multi- wavelength Photometry of Classical Cepheids
• The Rotation of the halo of NGC 6822 from the radial velocities of carbon stars
• Inadequate turbulent support in low-metallicity molecular clouds
• AT 2017fvz: a nova in the dwarf irregular galaxy NGC 6822
• Consistencies and inconsistencies in redshift-independent distances
• Euclid: Early Release Observations -- The star cluster systems of the Local Group dwarf galaxies IC 10 and NGC 6822
• On the dwarf irregular galaxy NGC 6822. I. Young, intermediate and old stellar populations
• The dwarf irregular galaxy NGC 6822. II. Young, intermediate and old stellar populations: comparison between theory and observations